{"title":"Rhythmic Patterns of a Sandy Coast and Self-Organization of the Relief","authors":"I. O. Leont’yev","doi":"10.1134/s0001437024700267","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology. It is shown that the dynamics of the contour and profile of the coast can be described in terms of the diffusion equation, which allows for both attenuation and growth of relief perturbations. The conditions are determined under which the self-organization mechanism is activated and the resulting perturbations grow over time. Rhythmic structures of the coastal contour are traditionally associated with waves propagating at a large angle relative to the coastal normal. However, it has been shown that the self-organization of beach cusps and megacusps also occurs in normal coast waves due to the development of circulation cells in the surf zone. The conclusion is substantiated that the formation of nearshore bars under certain conditions is also determined by the self-organization mechanism. The results obtained help to interpret the available observational data regarding the evolution of multiple bar systems.</p>","PeriodicalId":1,"journal":{"name":"Accounts of Chemical Research","volume":null,"pages":null},"PeriodicalIF":16.4000,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Accounts of Chemical Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s0001437024700267","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology. It is shown that the dynamics of the contour and profile of the coast can be described in terms of the diffusion equation, which allows for both attenuation and growth of relief perturbations. The conditions are determined under which the self-organization mechanism is activated and the resulting perturbations grow over time. Rhythmic structures of the coastal contour are traditionally associated with waves propagating at a large angle relative to the coastal normal. However, it has been shown that the self-organization of beach cusps and megacusps also occurs in normal coast waves due to the development of circulation cells in the surf zone. The conclusion is substantiated that the formation of nearshore bars under certain conditions is also determined by the self-organization mechanism. The results obtained help to interpret the available observational data regarding the evolution of multiple bar systems.
Abstract The phenomenon of rhythmic patterns of the coastal-zone morphology (beach cusps, longshore sand waves, spits, and nearshore bars) is considered the result of self-organization of the relief when a positive feedback is established between sediment transport and morphology.研究表明，海岸轮廓和剖面的动态可用扩散方程来描述，该方程允许地形扰动的衰减和增长。确定了自组织机制启动和由此产生的扰动随时间增长的条件。传统上，沿岸轮廓的韵律结构与相对于沿岸法线以大角度传播的波浪有关。然而，研究表明，在正常海岸波浪中，由于冲浪区循环单元的发展，也会出现滩尖和巨 穴的自组织现象。结论证明，在某些条件下，近岸条带的形成也是由自组织机制决定的。所获得的结果有助于解释有关多条带系统演变的现有观测数据。
期刊介绍：
Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance.
Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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